Lath-board.



S. M. FORD.

LATH BOARD.

APPLICATION FILED IULYH, I914.

- Patented 00t.12, 19151 2 SHEETS-SHEET l- Patented 0011.12, 1915.

2 SHEETS-SHEET 2.

SILAS m. roan, or ST. PAUL, mmnnsom.

LATE-BOARD.

' Specification oflLetters Patent.

Application filed July 14, 1914. Serial No. 850,913.

To all whom it may concern Be it known that I, SILAs M. FORD, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Lath-Boa-rds, of

- which the following is a specification.

My invention relates to improvements in lath-board, that is board designed to be fastened to the studding or beams to form a foundation for plaster.

Among the objects of the invention are to provide a lath board of waterproofed paper or other flexible sheeting which is'corr'ugated or made with lath projections to receive plaster and form air spaces, which can be made in sheets and cut to the size and shape desired in use, and which is so constructed that it can be handled without losing its form.

Further objects are to provide a lath board which will 'be resilient enough to yield to the expansion of the plaster so as to prevent the same from cracking, and which is provided with locks to prevent the plaster from slipping.

To these'ends the invention consists in the construction, combination and arrangement of parts hereinafter described and claimed.

-In the accompanying drawings showing an embodiment of the invention, Figure 1 is a perspective view of a fragment off lathboard embodying the preferred form of the invention; Fig. 2 is a side edge elevation thereof; Fig. ,3 is a perspective view of a roll of the lath-board without a backing sheet; and Fig. 4 is a perspective view of a section of the board secured in place upon the studding of a building.

The lath-board of the present invention is made preferably of waterproofed paper, such as rope stock surfaced with asphalt and paraflin wax. This will give it a glossy finish, which I prefer to 'use because then the plaster will not adhere to the board but will leave a small air space next to it. The flexible waterproofed sheet is then pressed or molded to form corrugations or alternate projections and depressions, the projection on one side forming the depression on the other side and vice versa. These corrugations are preferably of keyed lath shape, that is of the shape of a lath having keyed or inwardly inclined sides, as shown in the drawings, where 2, 2 represent the plastering faces of the stamped up lath like projections and 3, 3 their inwardly inclined sides. These projections are spaced apart from one another, and between them are similarly shaped but oppositely directed depressions 4, 4'adapted to receive and hold the plaster. Inside of the hollow stamped up lath projections are longitudinal air spaces 5, 5, which serve as heat insulating and sounddeadening' spaces. To hold the corrugations, or lath projections to form, that is to prevent them frombecomin-g flattened out and spread apart in rolling, handling or use, reinforcing strips 6 are passed transversely through the lath projections just under their faces 2, so that the lath projections are strung, as it were, on these strips. The strips are approximately parallel and spaced'a-part a. suitable distance, as shown in Figs. 3 and 4. These strips may be of any desired cross sectional shape. In Fig. 3 they are shown as flat metalstrips rectangular in cross section, while in Figs. 1 and 2 they are shown as round rods or wires. When flexible, they-will allow the board to be easily-rolled up, as shown in'Fig. 3, while at the same time they will hold the corrugations to form. If desired a flexible Waterproofed backing sheet 7 of the same or other flexible material may be placed upon the back of the corrugated sheet and made to adhere to it by asphalt or other suitable binding mean-s.

In use the board will be made in a long sheet of convenient width from which'suitable lengthsor sections of board can be cut off and nailed to the studs 8 by means of staples 9 driven through the board over the strips6, as shown in Fig. 4, so that the staples will embrace and bear against the strips. When the board is in place and Patented Get. 12, 1191s.

plastered over, the plaster will fill the keyed lath-shaped depressions4 between the lath projections and become anchored therein, While under each lath face will be aheat and sound insulating airspace, so that the lath board will serve as an insulating sheet. And when the corrugated sheet is itself waterproof, as is preferable, it will be unnecessary to place any other waterproof materialbetween the board and the studding.

It will be seen that the metal strips not only serve to hold the corrugations or lath projections to form, so that the board can be handled without flattening the corrugations, but also aflord a convenient anchoring means for nailing the board to the studding,

for owing to the thinness of the board, it would be apt to tear if reliance were placed upon the board alone to hold to the nails or screws. The strips and staples also serve as additional locks to hold the plaster from sliding lengthwise along the channels between the lath projections. Furthermore the corrugations or lath projections are sufliciently flexible and elastic to yield when the plaster expands under changes in temperature and humidity, 50 that the plaster is less likely to crack or to shrink away from the lath board. I

I claim as my invention:

1. A lath board comprising asheet of flexible waterproof material corrugated to.

form interspaced projections and intermediate depressions, and reinforcing strips incorporated in the sheet and extending transversely of the corrugations for holding the corrugations to form.

2. A lath board comprising a sheet of tions and passing transversely through the same whereby to hold them from collapsing.

3. A lath board comprising a sheet of flexible material corrugated to form interspaced lath projections and intermediate depressions and reinforcing strips piercing the projections and passing transversely through the same just under the lath faces thereof, whereby to hold the projections from collapsing.

In testimony whereof I afiix my signature in presence of two witnesses SILAS M. roan.

\Vitnesses ARTHUR P. Lo'r RoP, H. SWANsoN. 1 

